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參數(shù)資料
| 型號： | TDA4780 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | RGB video processor with automatic cut-off control and gamma adjust |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP28 |
| 封裝： | 0.600 INCH, PLASTIC, DIP-28 |
| 文件頁數(shù)： | 25/44頁 |
| 文件大?。?/td> | 321K |
| 代理商： | TDA4780 |
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1997 Feb 06
25
Philips Semiconductors
Preliminary specification
RGB video processor with automatic
cut-off control and gamma adjust
TDA4780
Signal limiting (the limitation acts on contrast and at low contrast on brightness)
A
VERAGE BEAM CURRENT LIMITING
(
PIN
15)
V
15
V
15
V
15
V
15
I
15
P
EAK SIGNAL LIMITING OF OUTPUT SIGNALS
(
PIN
16;
THE LIMITATION ACTS
1H
DELAYED
;
LIMITING LEVEL ADJUSTABLE BY
I
2
C-
BUS
(
SUBADDRESS
0AH;
CONTROL BIT
RELC = 0))
start of contrast reduction
input range for full contrast reduction
start of brightness reduction
input range for full brightness reduction
input current
4
2
2.5
1.6
0.5
V
V
V
V
μ
A
V
24, 22, 20(max)
V
24, 22, 20(min)
I
16(max)
maximum limiting level
minimum limiting level
maximum discharge current at peak
drive
extrapolated from 2FH
I
2
C-bus data 00H
RELC = 0
6.8
4
2.3
7.2
3
6
V
V
mA
P
EAK SIGNAL LIMITING
(
PIN
16;
CONTROL BIT
RELC = 1;
LIMITING LEVEL
(V
L
I
L
)
ADJUSTABLE BY
I
2
C-
BUS
(
SUBADDRESS
0AH))
V
LiL
equal gain in white point
adjust; signal only in
one output channel;
peak drive limiting
starts, if the maximum
of the RGB signals
after white point
adjustment exceeds a
threshold
I
2
C-bus data 3FH
I
2
C-bus data 00H
maximum limiting level
minimum limiting level
3.2
1.2
3.5
1.5
4.0
1.8
V
V
D
ISCHARGE CURRENTS
(
CUT
-
OFF MEASUREMENT LEVEL
MX = MR
OR
MB
OR
MG)
I
16(tot)(dch)
Threshold 1 (TH1)
total discharge current
I
16
= I
16(1)
+ I
16(2)
+ I
16(3)
I
16(1)(max)(dch)
maximum discharge current
TH1 = MX + V
LiL
; 1 line
delayed and low-pass
filtered
4.5
6
7.5
mA
S
steepness
15
mA/V
Low-pass filter, control bit TCPL
t
DPDL
time constant low-pass filter
TCPL = 1 (at 1f
H
);
RELC = 1
TCPL = 0 (at 2f
H
);
RELC = 1
0.9
1.2
1.5
μ
s
t
DPDL
time constant low-pass filter
0.4
0.6
0.8
μ
s
Threshold 2 (TH2)
I
16(2)(max)(dch)
maximum discharge current
TH2 = MX + V
LiL
×
1.10;
1 line delayed
4.5
6
7.5
mA
S
steepness
15
mA/V
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
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